PVC Post-Marketing Surveillance 3 — Questions and Answers
Question 1: Which of the following best defines a 'cohort event monitoring' study in post-marketing surveillance?
- A retrospective review of patient charts selected at random from hospital records
- A prospective follow-up of a defined group of patients exposed to a specific drug to capture all medical events (Correct answer)
- A case-control study nested within a spontaneous reporting database
- A meta-analysis of phase III clinical trial safety data
Correct answer: A prospective follow-up of a defined group of patients exposed to a specific drug to capture all medical events
Cohort event monitoring prospectively follows an exposed cohort, capturing all events regardless of suspected causality to identify safety signals.
Question 2: The Benefit-Risk Balance (BRB) assessment in post-marketing surveillance weighs which two primary factors?
- Market share and drug cost against patient adherence
- Clinical benefits of treatment against known and potential risks (Correct answer)
- Number of prescriptions against number of adverse event reports
- Drug efficacy in clinical trials against real-world effectiveness
Correct answer: Clinical benefits of treatment against known and potential risks
The BRB assessment compares the clinical benefits of a drug (efficacy, patient outcomes) to its risks (adverse effects, misuse potential) to justify continued marketing.
Question 3: In pharmacovigilance, a 'labeled' adverse event is one that:
- Has been confirmed in a randomized controlled trial
- Is already described in the product's current approved labeling (Correct answer)
- Has been classified as serious by the reporting physician
- Was identified during phase II trials and retained in the NDA
Correct answer: Is already described in the product's current approved labeling
A labeled adverse event is one already listed in the approved product label; unlabeled (unexpected) events require expedited reporting.
Question 4: Which of the following signal detection methods compares the observed-to-expected ratio of drug-event combinations in spontaneous reporting databases?
- Logistic regression analysis
- Proportional Reporting Ratio (PRR) (Correct answer)
- Kaplan-Meier survival analysis
- Bradford Hill criteria evaluation
Correct answer: Proportional Reporting Ratio (PRR)
The PRR is a disproportionality analysis method that compares how frequently a drug-event pair appears relative to all other drugs reporting that event.
Question 5: A pharmacovigilance professional receives an adverse event report where the patient outcome is listed as 'not recovered/not resolved.' How should the case be classified?
- Non-serious, as the patient did not die
- Serious, because ongoing harm qualifies as a serious outcome under ICH E2A (Correct answer)
- Non-serious unless the event caused hospitalization
- Indeterminate until the patient outcome is updated
Correct answer: Serious, because ongoing harm qualifies as a serious outcome under ICH E2A
Under ICH E2A criteria, 'not recovered/not resolved' signifies persistent harm and must be considered when evaluating seriousness, which can qualify a case as serious.
Question 6: What is the primary purpose of a Drug Utilization Study (DUS) in the post-marketing setting?
- To assess the pharmacokinetics of a drug in special populations
- To evaluate how a drug is prescribed, dispensed, and used in real-world practice (Correct answer)
- To compare the drug's efficacy to that of competitor products
- To determine the optimal dosing regimen through dose-escalation trials
Correct answer: To evaluate how a drug is prescribed, dispensed, and used in real-world practice
A DUS describes patterns of drug use in a population, including prescribing practices, patient demographics, and deviations from approved labeling.
Question 7: Which type of post-marketing study is MOST appropriate for detecting rare adverse events that occur in fewer than 1 in 10,000 patients?
- Open-label extension studies from phase III trials
- Large simple safety trials or large-scale database studies (Correct answer)
- Phase IV dose-finding studies in healthy volunteers
- Randomized crossover trials in inpatient settings
Correct answer: Large simple safety trials or large-scale database studies
Large simple safety trials and database studies enroll or analyze tens of thousands of patients, giving adequate statistical power to detect rare adverse events.
PVC Post-Marketing Surveillance 3
Which of the following best defines a 'cohort event monitoring' study in post-marketing surveillance?